/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ #ifndef _UAPI__CRAMFS_H #define _UAPI__CRAMFS_H #include <linux/types.h> #include <linux/magic.h> #define CRAMFS_SIGNATURE … /* * Width of various bitfields in struct cramfs_inode. * Primarily used to generate warnings in mkcramfs. */ #define CRAMFS_MODE_WIDTH … #define CRAMFS_UID_WIDTH … #define CRAMFS_SIZE_WIDTH … #define CRAMFS_GID_WIDTH … #define CRAMFS_NAMELEN_WIDTH … #define CRAMFS_OFFSET_WIDTH … /* * Since inode.namelen is a unsigned 6-bit number, the maximum cramfs * path length is 63 << 2 = 252. */ #define CRAMFS_MAXPATHLEN … /* * Reasonably terse representation of the inode data. */ struct cramfs_inode { … }; struct cramfs_info { … }; /* * Superblock information at the beginning of the FS. */ struct cramfs_super { … }; /* * Feature flags * * 0x00000000 - 0x000000ff: features that work for all past kernels * 0x00000100 - 0xffffffff: features that don't work for past kernels */ #define CRAMFS_FLAG_FSID_VERSION_2 … #define CRAMFS_FLAG_SORTED_DIRS … #define CRAMFS_FLAG_HOLES … #define CRAMFS_FLAG_WRONG_SIGNATURE … #define CRAMFS_FLAG_SHIFTED_ROOT_OFFSET … #define CRAMFS_FLAG_EXT_BLOCK_POINTERS … /* * Valid values in super.flags. Currently we refuse to mount * if (flags & ~CRAMFS_SUPPORTED_FLAGS). Maybe that should be * changed to test super.future instead. */ #define CRAMFS_SUPPORTED_FLAGS … /* * Block pointer flags * * The maximum block offset that needs to be represented is roughly: * * (1 << CRAMFS_OFFSET_WIDTH) * 4 + * (1 << CRAMFS_SIZE_WIDTH) / PAGE_SIZE * (4 + PAGE_SIZE) * = 0x11004000 * * That leaves room for 3 flag bits in the block pointer table. */ #define CRAMFS_BLK_FLAG_UNCOMPRESSED … #define CRAMFS_BLK_FLAG_DIRECT_PTR … #define CRAMFS_BLK_FLAGS … /* * Direct blocks are at least 4-byte aligned. * Pointers to direct blocks are shifted down by 2 bits. */ #define CRAMFS_BLK_DIRECT_PTR_SHIFT … #endif /* _UAPI__CRAMFS_H */
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